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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7715919b16952b91f5bfc65d2bc09505ef75d4a0461a21bbc6d342d19a8aa0d4' 
  AND token = 'XUTyb4miZ5WAlOzzDmrRrMJ7eqO8jABo/2xqF+H7580=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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