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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4774e524e24dae5934f92cf07b5ac92b55c3e3f7e54475d47a05d0e76168f784' 
  AND token = 'fKmhb3cwMGi3o8zPEdn1Jbxwgq+DgoiIgQHQnQyqjhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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