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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0aeac9bc0f6bc7db58c7ad6f46f07907895730b0ba76e947213b601a4fb0bb1b' 
  AND token = '7Pcb753YOt0FJB5klK9YsVa8Qx3YU2Kbf+nZNWfjQ2Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}