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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71f1a9e7e11c2c3b6a1713b9f11e47df24107e49154ba68eeb4c70b30b2161bb' 
  AND token = 'Fu85SeqFL3BgKS8v0Z9cPnBJr5FH3no8OgwY0FhQDu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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