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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98c3c0aa12e1acfd0f5da6ddd29516c5c01c0d881fba1c9b9db4e2b9cde52f13' 
  AND token = 'kaAIQ2/1oUB23eW5u1+RtZY7Qkj28guBEpJlxN0pT24=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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