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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea7bb9a1964b1e2ef504e5c1ac6054095f055160357d6ade9f7829874b32e364' 
  AND token = 'mblEgZvvntEGv6CtjK0s3lvjEhj8oRvhphI79id37Kk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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