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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c813f3ae2d4b3b9ae5fd8b15919f6b3f19edf6f4551f9fed5501c376f0a8d3f3' 
  AND token = 'x2opMq3LEqRtOYc+MvOC0fHWuy+XOJ5bGjS93wlAl10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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