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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f94ebd68e3be32a6f0ff99c418797d4230438b75b34dab6eb8feeb44a6b0b29' 
  AND token = '4dwebbNaznZkfyCVEeOuYqPCT6iRTVmuwsRyVeIYgj0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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