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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cfcf22609b3cc7a6847ca6359c3969bd750e74a21aeecf6bc4ebfe26b44e71' 
  AND token = 'Km1pBoynFMUDwNHIL0VCaByn0EsjfngWqdEKqOp9TEA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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