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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fbc2e6020c401f4d2b8c812b8f08b828529c5ee95f9093e1db0a7dc8a239079e' 
  AND token = 'g2gIJcF5QYxL/Kwdf9wo21Ut1OVm0O+BNt3Kx8ywEMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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