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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b31aa718bc1ce61352d7e4aca3a549a8ea85e1c471386e6f875fbdc543db31b7' 
  AND token = '+QSkppaRPRg5msFIAIkgq/+I3JYM7UBztXHxN4nDDzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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