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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b80ea933eede176139ee0c0139a4760489c7b5f55d7422404a5f9ff7418b3ddc' 
  AND token = 'aeQpRoPUc892/D5x2tadAGn12VGQT2uJJnvcK7bSne8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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