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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ca9c4395bfc27e5ea9c0331a41c1f0426e12541636891b35f9d4151a945f354' 
  AND token = 'hmYk07W0I0r6YfKn2HHRc+Lo/he0gzxJFnA71fA3tUs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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