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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85310ad268e3e395c8d09157b36be78ea14ebd5c9fe3ba24c39e4af0d9198167' 
  AND token = 'qP73eeWw2C0pBYewXOnrb7B1lsdsH7d/recS3exgbhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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