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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ec7d1ef9b7b12a872c4ee0745c5f0d0a5bce653a3732f12acd6609f4e9e5b7e2' 
  AND token = 'clJ9WZo4BIAyNYAQ1PoONunvKMqjvird55EOBVkszfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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