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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b60f4a8b5eeb21f066c4a030d5810c377cc6071e9d49db04836d87444090275e' 
  AND token = 'ABk5et6bJEXAleIzArgB59h6rEXx5xsnyoXWu59TOdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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