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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d17200d858d2e64150b45ebff84c4a860b2822b5c6cf232793820eae95d679e' 
  AND token = 'OKUHUzpqSUWhZU3MuEEuXfEji4S8m6pug3EX1I76zPU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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