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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d32047afe49d035306250389b4d56ac86a79f2fc9eb844044ab887ca980edd' 
  AND token = '0kznfq5IdeOGABxSdtFYHChS757zaZiBZ44dZwtDNy0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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