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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97e73ee7f4896a04edc39c34cc0d281dc4b698b1ab2ba99a398de5b2937bac4b' 
  AND token = 'L3hSPpc/SvyXORIhrIIA0ZiYG6sBMp4FEpdEdhr3gXc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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