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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66e0297f3a63d4930867ca164e221c970be538eb6e99a71aa9b246e82a28e155' 
  AND token = 'd++/A6zeoJjli9T9eHk7dxUvNJN1S2i94Kzfohaa4ro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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