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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5071e292bc1660cdffbe11b99c4c5560c924eeff671c4163307205c53ebf3641' 
  AND token = 'WHAiGxoI8xNQBJ6M0JFA+b6MhSxTKL/J3RAPEEdoU+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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