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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2de000ac9bb7546970911f0dcc8d580a7de01dcc8b0e3f988015fa35a7def3f9' 
  AND token = 'kqVlNGudJplwes65y7/qEaEgnlEvBPM7EQIqixuSaAE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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