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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24034c9f9878696519f9682b61cb772dc2f64872c610a41164b56b60a4f69dc2' 
  AND token = 'YSoCC8ro2O+x+j4Ah6a6eSyIcHlbL5Njn92/AAkHhzw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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