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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a02729b088cf778f1e72cad056ac6ebd10a1b78337077575804a9faaeed2827' 
  AND token = '98zmmh89vb0Y0Re+kJv08+cp+8y10EsVtiBiStz0OUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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