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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095ba9eb02e245f844a79b7121e41623716952561f6de210f00fbd866e3a84de' 
  AND token = 'oZj5Fe1jcdDnuqQohL5yFxej5apQz8gB6GqJbwuMz54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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