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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81801ab988f8d8fbc9ccbd379c5f1e9c973097f359c655713f976f2e92af1bea' 
  AND token = 'jvB6LwiVr8DBc4jf7s4KxAe2763rqSBsHa2gVPoVIEo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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