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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77779f1e27303b913bcb325faa28f6ea54200a4d6a839d98e4ee28d46b1b6ace' 
  AND token = 'o+uSSDeL0wgY4op7VMKeRmmwP6bvIDrLEVkb0zQWleU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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