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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7b85604305371d03142cf2c1173a96ad89f9f1e378bf522b8be62e9267cba1' 
  AND token = 'NKcDvCiJegjc/PUpduqivqcHqfxMPNtWl9OLJcYln7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00054

JSON explain

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