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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b0831e650af62f19826d1451435016a8f7d8b2c6696cf367198b67997b2411c' 
  AND token = 'E3qkn4Oh34aYZLbdDL81aDjk9GUxSqMQYA9zvr99Pqo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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