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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3af65a4a0b64adf5e0dfbdf3ed0660f60811c6ecd93eab239510aff9f00c1ee0' 
  AND token = 'VStrnFeJM5tqIok88MqPxb3akmo8boo91dAgaUak0s4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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