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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5873c878bf9457b29abbbd83177133cf28f774897bcb044bac9927871fe3631' 
  AND token = 'WzjMQ0+8dFZLfKC3oe+l1pxyormpW9OPRmE/2gHUYOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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