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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29521c88b635b1c112baec67c61a77df74bf1eafed2d3c35f89d1be70688e98' 
  AND token = '0xk1C0/e1Fps4tdZ3s7Aoy6O4lqc7NeBZJaB7Jj1eZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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