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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c9792b42faf3e1c8e1b4b0bf321e0e90e0be1629167c827efdc4f85a7e5b991f' 
  AND token = 'LEA9lgZ3HL5WdByOELLrUF2GyS58hz99bY4hyUsH6q8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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