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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98b26838aeae91ff4aaf8d727cf57b69e27dff86b3e452c8f313773246a7fc3f' 
  AND token = '5EV7r47GlnirhOAmMxHgP/6wFNt0DGh3YE0Pooh3Dvo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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