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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d5a5e64527c2611dfdd15ce8b113063cd310f879ba4857e816083d615251d85' 
  AND token = 'Ok6jWeIdkU2tnFK/gCohGdU0K33SNNMecy47xG0RHzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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