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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8845e303ce44fdd713cb4d9c30c55f80d7613c75d55a9a2df7f524f7c863be24' 
  AND token = 'bxWRkTxRCRhkaLZyCdcb4bb1QtMULRqZ5SAUqW4jVo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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