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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e47a7fe959ea62a9cfd432e68cc1b709f0a6e312422c755b1d0a6b932211b5c8' 
  AND token = 'kXDUswRLjV5VPg0CxEZZBpXku9MEZho1rs0VfN2YzFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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