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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9b867de2a508ca04ac1a292b9471aa744cce97b2481fa0518cca6c92941c6ed1' 
  AND token = '8t5An+KP3Xh8durLr6z50FHAFSkWpjpxTfKpkfR6jVc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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