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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62a90cd26279f3eb54c062b4c969fccba07bf10fd02bb75545ba33f70de7c94' 
  AND token = 'li2q1secYDr/A6315oElendLcgMilOudmRI9SCAMRu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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