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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2ef88a5ffa5e003cc90afdcf6d24ccc23f04f588b4b97ced29b2d4afb380428' 
  AND token = 'WpSuE6jvU+6AAe4uo43exs3QPP430lLGoG3zHxdAF70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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