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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '68be1eccfedc20130545a01a92abad1e81ee3f9574efed5e4ecd77121ad45955' 
  AND token = 'HTNQenN3rXwv521Jk+EzKGlaOxE1LtnkrP4oWZapILs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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