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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1c9b6fae3168826e87446889f103c9b1349a62ee95cac03d9c13c496702e93d1' 
  AND token = 'qVTDBUd/1zzWRQfAy183EfRfms7wex4ELKkn4sE8DbU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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