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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bacbc40ac096cceea559ccbf46745f9873704f487be86955bad74c9fdea244b6' 
  AND token = 'sg5ve+Bd4REvpRygiFVAYgO7CSUY3Ymf0h4TisQWbMs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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