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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c50fb21b42ad99a2de4e1b24a0dd8760af7358b9c4041627c26c83adaf270bea' 
  AND token = 'lOGLb86oXoXt+UL85+lB2r4gIktkW6sjGmVGIcqXhJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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