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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97388d4ac791c46fb3a802c7f8538a216aaa0b06149f12f8d697c32a9bc057a0' 
  AND token = 'cIMUXEcCTKRxcc+mtd1r237b7Zz0o2rgCUKg4xWwwAw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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