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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '711dd26498fa929dad3b7ee514889698eb9100c72fe5079a4e5a4ab16694b99c' 
  AND token = 'MkJ3kQC+nHh7531e8F880KV9SjSOovwdI38eVxxzQCY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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