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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0e4ff0c92038c43dd9da4ada5eb665349b7d835527b744d419d29950e340931' 
  AND token = '5rAK8h85z8Rawxn3S+m0Xs06ichS7FkC3bozqpvavPk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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