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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '401f279e4fe4fcd85abb507beba9a0b67c086a018b7beda679b4f0569a0498f2' 
  AND token = 'NnxXjk02378LdnfnOXHXik0Vt0s4QeRNokLvIkO+5Ts=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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