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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd566327ec9c175c940fbb0df42a322ffcf9bd87fb6a5be08a822bf2422ee0efb' 
  AND token = '7tvWJ7VT22VurdaVW0/su+haeo3wXU0iGS/NOVqYImI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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