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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46a9804305ee0adde166f77de60a803fa8a1a95e133b1cfc190ddb97ba312d72' 
  AND token = '/x4fjKbQckh+o+oxdBCEbd0YFz3S8h3pWUgcrCv3wKM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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