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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40e26e5ba0e2b9e7d4ac63a083daa12d58e15d0ff087b31a032df55d9c344244' 
  AND token = 'QQq9zotbTEHqFRgUHJjH13CQHSwt128Nt3Lc+++WETQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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