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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa03153c6232fff1574881c0089d43041b1d935d5ec4ca7715f859febb20d9ab' 
  AND token = 'eWnYbPslyNybbt8yzc6dULYbi1OVLzR+m7KQvd8xg3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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