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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f17b1a72c354cfa68bf3412d2bd34ff1d699cfe6ac18e8eb1f4fdbcfacdd3de' 
  AND token = 'KZWRdkPRbXvJhGkLkow1ErK4sWxpBq9tt33x+XpOFpQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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