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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '415df9ce1308eadd842614bac579066dd12cb06f7e6dd4c1f5d7a137c21dd9e0' 
  AND token = '+bTWBXg3ceeIvSW95op5TmjIc3XMUOJpw0xuq+q7F68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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