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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e90b3cfa12f21ca2625b2034b1ac2d59218448803c8c26997408e47adc419ec' 
  AND token = 'wRYaiNqWtAjaac3zFRq7tvja8PfenBqb8wbHkJ62Bwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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