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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e448433d3a8e4a2ec81a2e6f0d0b4daddab0ecdbee2e67c9b6bbed151287ae30' 
  AND token = 'uY+1NZjyDY053fFuR8Lc5Uahns5jHCComCUTIYgv7LI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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